Mix design is the process of selection of suitable
ingredients for the concrete and to determine the relative proportion with the
object of producing concrete of certain minimum strength and durability as
economy as possible.

Workability is defined as the amount of work required to
place concrete and to compact it thoroughly. workability of concrete is
increase with increasing of water content to concrete but it causes to reduce
the strength of concrete.

17.define masonry

Masonry is the construction structure it made either stone masonry or brick masonry
.masonry is used to construct buildings dams columns etc.

The brick in the facing are laid in alternate courses of
headers and stretchers .the header course is commenced with a queen header
followed by a queen closer and continued with successive headers the stretcher
coursed are formed by stretchers having a minimum lap of one quarter their
length over the header.